.pull_nav {
    position: relative;
}

.pull_nav ul {
    width: 160px;
    padding: 0;
    margin: 0;
    height: 0;
}

.pull_nav li {
    list-style: none;
    height: 40px;
    line-height: 40px;
    margin: 0;
    padding: 0;
    background-color: white;
}

#button_nav {
    text-align: left;
    background-color: white;
    border: 1px gray solid;
}

#button_nav:hover {
    background-color: unset;
    border: 1px gray solid;
}

.button_nav_two,
.button_nav_three {
    display: none;
}

.button_nav_one {
    position: absolute;
    top: 44px;
    left: 15px;
    overflow: hidden;
    transition: all 0.3s linear;
    background-color: white;
    height: 0;
    z-index: 999;
}

.button_nav_two {
    position: absolute;
    top: 0px;
    right: -160px;
    z-index: 999;
}

.button_nav_three {
    position: absolute;
    top: 0px;
    right: -160px;
    z-index: 999;
}